Type-writing machine.



C. H. SHEPARD.

TYPE WRITING MACHINE.

APPLICATION rum) 001211. 1912. 1,052,758. Patented Feb. 11, 1913.,

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c. H. SHEPARD. TYPE WRITING MACHINE.

APPLIUATION FILED 00T.11, 1912.

Patented Feb. 11, 1913.

2 BHBETH-SHEET 2.

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07 MG/Q 1-ll5 ATTORNEY UTED STATES PATENT ori ro,

CHARLES H. SHEPARD, OF NEW YORK, N. Y.) ASSIGNOR TO UNION TYPE\V RIT ERCOMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

TYPE-WRITING MACHINE.

Specification of Letters Patent.

Patented Feb. 11, 1913.

Application filed October 11, 1912. Serial No. 725,159.

To all whom it may concern:

Be it known that I, CHARLES H. SHEPARD, citizen of the United States,and resident of the borough of Manhattan, city of New York, in'thecounty of New York and State of New York, have invented certain new anduseful Improvements in Type-Writing Machines, of which the following isa specification;

My invention relates to typewriting machines and more particularly tocarriage es'capement mechanism.

The main object of my invention, generally stated, is to provide a rapidescapement in chanism which is comparatively simple i reliable in use.

A further object of my invention is to provide an improved constructionof the character specified in which parts may be readily adjusted tonicely regulate the op .eration of the escapement.

Another object of the invention is to pro vide an improved roller dogconstruction in which the action of the roller holding dog ,may'bevariedand nicely timed with refer-v- 'ence to the release of the.stepping-dogf A still further object-of my invention is to. provide anescapement in which but little noise is produced byitsactuation and 7.by the return movement of the carriage.

To the above and otherends which will lereinafter appear, my inventionconsists in the features .of construction, arrange ments of parts andcombinations of devices set forth in the following description andparticularly pointed out in the appended claims. l

In the accompanying drawings, in which like referencechfi'rzictrs'indicate likeparts, Figure 1 is a fragmentary fore'and aftvertical sectional ne of one form of typewriting machine embodying myinvention, only so much of the typew'riting machine invention in itsembodiment therein. -Fig. 2 is an enlarged detail rear elevation, withparts in section, of a portion of the escapement mechanism. -Fig. 3 is adetail side view of the roller dog and its carrier or dog rocker. Fig. 4is a fragmentary dia- ,grammatic view of the roller dog and esc'apementwheel, the view showing the parts as they appear when viewed from thedirection of-tlee arrow inlfig. 2, and as though the stepping mentaryrear elevation ofa portion of the- .7 escapement mechanism, showing theparts construct-ion and is efficient and meshes with a feed pinion 11.

beingshown as is necessary to illustrate my the teeth of the escapementwheel were in section, such section being taken on the line of Fig. 2.Fig. 5 is a detail side view of the returning spring --for the steppingdog, the view showing the manner of supporting the spring and connectingit with 0g. Fig. 6 is a detail fragas they appear when the stepping dogis released from the escapement wheel.

I have shown my invention embodied in a No. 10 or No. 11 Remingtonmachine, although some of the parts of that machine are only.conventionally represented. It should be understood, however, that theinvention may be embodied in various styles of typewriting machines.

The frame of the machine comprises a base 1, corner posts 2, and a topplate 3.

A cylindrical platen 4 is mounted in a carriage 5, the latter beingsupported on antifriction balls or rollers 6 Which are received theusual manner to a spring drum 7 by.

which the carriage is propelled in the direction of its feed. IRearwardly extending arms 8 are pivoted at 9* to the carriage and areconnected at their rear ends to a feed rack 10 which This feed pinion isfixed to the forward end of a shaft 12' received in a bearing 13provided with a base or foot piece 14 by which the bearing may besecuredto the top plate .of the machine. The rear end of the shaft 12has fixedly connected thereto an escapeme'nt rack or whef 15,. .Thus theescapement wheel has a rearwardly extending hub 16 tapped to receive setscrews 17 which extend through the tapped openings and hear at theirinner-ends against flattened faces 18 on the shaft 12 in order tofixedly connect the escapement wheel to said shaft,

Key levers 19 are fulcrumed on a fulcrum bar 20 and extend -to thekeybo-a'rd of the machine where they are provided with finge-rckeys 21'.Each key lever is connected by links 22 and 23 and a sub-lever 24 to atype bar 25 pivoted to swing upwardly and rear wardly and to strikeagaiust the front face of the platen 4. Extending transverselybeopenings in the base of the machine."=' A cen trally disposedrearwardly projecting crank arm 31 extends from the rock shaft and isconnected to an upwardly extending link 32.

The upper end of this link is pivoted to. a

forwardly projecting arm 33 of a dog rocker, designatedas a whole by thereference numeral.34. A shaft 35, which is fix; edly connected to thedog rocker, is sup-' ported at itsends in bearings'36 adjustably mountedin bearing openings in lugs 37 and secured in theiradjusted positions byset screws 38. The lugs 37 project rearwardly from a bracket plate39'sec'ured to the frame:

of the machine. A depending pin 40 on the dog rocker is connected to oneend of a corn tractile spring 41 which'has its opposite end connected toa fixed'bracket arm 42 secured to the-bracket plate 39. The dog rocker34 likewise has an upwardly extending dog carrying arm 43 which istapped to receive a screw stop 44 which extends through to theforward-side of the dog rocker where it is adapted to cooperate with aprojection 45 on the bracket plate 39 to limit the pivotal movement ofthe dog rocker on t he depression of a key. The return-movement of theried by-the arm 33 of the dog roekei' an'd cooperating with theprojection to :arrest the dog rocker when pressure on the-finger:

dog rocker is limited. by a' 'se'tscrewf46-car key is'released and therocker is returned to" spring 41. A look nut 47 may be employed tosecure the screw stop 44 against accinormal position under the powerof'the dental displacement from its adjuste'dposition. In a like mannera lock nut-18 may be secured to cooperate with'the set screw 46 tosecure it in its adjusted position. The upper end of'the upright arm 43of the dog rocker is slotted, as at 49, to receive a step ping dog 50.The slotted portion. of the rocker forms two arms, one on each side ofthe stepping dog and each ofthese arms is slotted at 51 for thereception of a pin 52 which projects laterally from the stepping dog. Inthis manner the normally engaged stepping dog is mounted for bothsliding and pivotal movement in the plane thereof on the dog rocker andis limited-in its pivotal movement in one direction-by an abutj ment 53projecting from the dog rocker. A spring 54 is looped-at its lower end,as at 55, and is secured at its looped end to the dog rocker by a screw56. v The opposite end of the spring extends into an opening 57 in theloose or stepping dog. It will be seen that 5 theconstruction' of thespring is such that it exertsi aiforce longitudinally of the spring as.wellas transversely thereof in order to 'retji rn thestepping dog tonormal position I and'to'render the spring. efiective both to slide thedog and turnit-on its pivotal sup port. However, the arrangement is suchthat in the .normal position of the parts I shown "in Fig; 2, thebottornwall of. the' opening 57does not contact with the upper end-ofthe spring-54. The ettect o'fthis is that when the. stepping dog 50gisreleased from the escapementiwheel, it will receive 'a turning movementonitspiyot 52, as well as a sliding movement .infyitejiguideslot; the

dog moving from the 2 to that'indicated in t1 the fact that l 'sho\vn inFig. This-is due to Figs. 2 and 6),andxt-he'engaging-end of the dog 50being heavier than its opposite end turns the dog by gravity on itspivot 52 until I the-bottomof the opening 57 contacts with the upper endof the spring 54, thus arresting the dog in the position-shown in Fig;6.-

The purposeof this, is two-fold. In the'first place the stepping dogwhen released from the wheel is not snapped by spring against-a fixedabutment to limit the-move ment'of thedog but's ich movement is lim-fjited thespring itselfand consequently there is little or nofnoise.produced whenthe steppingdog is released and .'-springs forwardly. Inthe second place there is a lost motion provided between the upper endof thespring 54 and thebottom [wall of the opening 57 when the parts arein the normal position shown in Fig. 2-, so that if at this time thecarriage should be moved back to begin a new line of writing, thebackward rotation ofthe escapement wheel results in the rear inclinedfaces of the teeth 15 there of co-acting with the rear inclined face ofthe stepping dog, forcing the latter down below the' position shownin'Fig. 6. The first part: of this turning movement of the dog to theFig. 6 position takes up the lost motion and the last past of themovement is slightly below the position shown in Fig. 6 to clear theteeth of the escapement wheel. It isthe last part of the movement aloneof the dog which is exerted longitudinally against the spring 54 so thatonly a very slight return movement of the dog under the power of theflexed spring is effected and but very little noise is produced duringthe backward movement of the cscapement wheel, and yet there isareliability of action of the parts. As soon as a tooth on the escapementwheel passes the stepping dog, the latter is immediately returned to theFig. 6 position to coact with the teeth of the escapement wheel toprevent a forward movement thereof. \V hen the pressure of the carriagespring is exerted through the v ment of the rocker.

escapement wheel against the stepping dog,.

it assumes the position shown in Fig. 2

A holding dog, which in the present instance is in the nature of aroller dog 58, is pivoted on a shouldered pivot screw 59 and sopresented to the teeth of the escapement wheel that the periphery of theroller dog constitutes its working face. This holding dog is mounted andsupported independently of the stepping do and independently of the'dogrocker 34. bus the shouldered ivot screw 59 is received at its threadedend in a tapped opening in an upright arm 60 of a second dog rocker,which is indicated as a whole by the reference numeral 61. The dogrocker 61 comprises in addition to the upright arm 60 a pivot rod 62 towhich the upright arm is riveted or otherwise fixedly connected. A.horizontally disposed memher or portion 63 projects from the upright arm60 and carries a depending arm 64. Thepivot rod 62 is received inbearing openings in arms 65 and 65 of a bracket 66. A collar 67surrounds the pivot rod 62 adjacent to the bearing arm 65 and is fixedto the pivot rod by a set screw 68. It will thus be understood that alongitudinal movement of the pivot rod 62 in its bearings is preventedby the collar 67 bearing against one side of the bracket arm 65 and theupright arm 60 of the rocker bearing against the o posite side of thebracket arm 65*. A coile spring 69 surrounds the pivot rod 62 and isconnected atone end to the 5 bracket 66 and at its opposite end to thecollar 67. The power of this spring is exerted to maintain the dogrocker 61 in the normal position where the roller dog 58 is maintainedout of the path of the teeth in 0 the escapement wheel, as illustratedin Fig. 1. An adjustable screw stop 70 is received in a tapped openingin an 0 I set portion 63 of the part 63 of the dog rocker 61. The lowerend of this screw stop co-iacts with the 5 top plate 3 of the machine tolimit the return movement of the dog rocker 61 under the power of thespring 69. From an inspection of Fig. 3 it will be observed that thescrew stop 70 is offset from the pivotal center of the dog rocker 61 inorder to operate effectively to arrest the return move- It will also beobserved from an inspection of Figs. 1 and 2 that the depending arm 64of the rocker 61 extends in the path of movement of an adjustableabutment which is in the nature of a screw 71 received in a tappedopening in the dog rocker 34 and extending therethrough. This screw maylikewise be provided with a lock nut 72 to prevent an accidentaldisplacement of the screw. The bracket 66 by which the dog rocker 61 issupported is fixed to the frame of the machine in any suitable manner.In the present instance, it has been convenient to secure the bracket tothe base 14 of the bearing for the escapement wheel shaft, by means ofscrews 73. From the foregoing description it will be understood that therocker 61, and the roller dog 58 carried thereby, are supported entirelyindependently of the dog rocker 34, and the dog carried thereby,although the rocker 61 is under control of the rocker 34.

In the operation of the esca ement a depression ofa printing key is eective to depress the universal bar 26, thereby turning the do rocker 34to move the upright arm thereo forwardly transversely of the plane ofthe feed rack or escapement wheel. The effect of this movement it todisengage the stepping dog 50 from the escapement wheel and the dogreceives a forward movement,

aided by its spring 54, to the position shown in Fig. 6, so as to be ina position to cooperate with the next advancing tooth of the escapementwheel when the dog rocker 34 returns to its normal position. During themovement of the dog rocker 34 just described the adjustable contact 71will eugage the depending arm 64 of the indrapendently supported dogrocker 61 and e eat a rearward movement of the roller dogtransescapementWheel against letter feed movement after it has been released by thestepping dog. As soon, however, as pressure is released on the depressedfinger key, the escapement wheel will cam the roller dog out of the pathof the engaged tooth thereof and movement thus transmitted to the dogrocker 61 will likewise be transmitted to the dog rocker 35 to speedilyreturn both of these dog rockers to normal position. It will beunderstood of course that the respective sprin s 69 and 41 for the dogrockers are also e ective to aid in the restoration of the rockers tonormal position.

By the construction and arrangement of the parts, the adjustable meansbetween the two dog rockers, and the mountin and supporting of theroller dog indenen ently of the stepping dog, I am nabled to regulatethe parts so that i desired an initial movement of the dog ro ker may beeffected independently of the rocker 61 and the latter may be taken upat any portion of the stroke of the dog rocker 34 to nicely regulate ortime the interpositioning of the roller dog in the path of the advancintooth of the escapement wheel, and wit reference to the instant when theescape ment wheel is freedjrom control of the.

stepping dog, By this arrangement I am enabled to adjust the parts so asto provide various extents of drop at the down stroke of the key andotherwise nicely regulate and control the action of the escapementmechanism. Thus, for example, it will be understood that the furtherforward the contact screw 71' adjusted, the greater will be the extentof rearward throw of the roller dog, and the less \will .be the extentof the drop when the carriage is let off or released from control of thestepping dog This will be more clearly understood from an inspection ofFig. 4. If, for example, it be assumed that the roller dog 58 is nonmally maintained in the full line position and that the adjustment ofthe contact screw 71 is such that upon a depression of a printing keythe roller dog will be shifted to the dotted line position a when thestepping dog is released, it will be understood that the working face 5of the advancing tooth of the escapement wheel will drop from theposition shown in Fig. 4 to the point on the periphery of the roller dogindicated at c. This atfords considerable drop of the wheel during thedown stroke of the key. If,'on the other hand, the adjustment of thescrew 71 is such that the roller dog will be shifted from the full lineposition in Fig. 4 to the dotted line position (i at the down stroke ofthe key, then the periphery of the roller dog will be brought to a pointwhere it will almost contact with the working face 6 of the advancingtooth of the escapement wheel so that little or no drop of' the.escapement wheel is afforded. These are merely taken as two examples ofthe numerous adjustments that may be effected. It will be understood,therefore, that the parts may be nicely adjusted to control or regulatethe action of the escapemcnt, and that although an ordinary feed isprovided the escapement is very rapid and efiicient.

The power of the carriage spring exerted through the escapement wheel onthe roller dog is effective to cam the rocker 61 back to normal positionas pressure is released on the depressed printing key and the pressurethus exerted on the rocker 61 is likewise efi'ective to return the dogrocker 34 to normal position. From this it will be understood that thepower employed to movethe carriage is exerted through the esoapementwheel to return both of the dog rockers to normal position. Moreover, itwill be understood that by the present construction the roller dog maybe maintained normally in a position where it just clears the path ofthe teeth of the escapement wheel, as shown in Fig. 1, so that a veryslight rearward movement of the roller dog is effective to bring it intothe path of the teeth of the escapement wheel and that this is'true nomatter how much movement may be necessary or found desirable to releasethe stepping dog from engagement with the j escapement Wheel. If desiredthe parts may be so arranged that the adjustable contact 71 will nottake up the dog rocker 61 until about the last part of the movement ofthe dog rocker 34. The power of the spring 69 and the weight of the dogrocker 61 and the parts carried thereby will, under these circumstances,offer no resistance to the depression of the key at the initial part ofthe stroke and a rapid, light and efficient escapement mechanism isprovided wherein the wear on the holding dog is distributed throughoutthe periphery thereof, it being understood that the peripheryconstitutes the working face of the roller dog and is constantlychanging, due to the engagement of the teeth of the escapement wheeltherewith. Thus as pressure is released on a printing key, the advancingtooth of the escapement wheel, contacting with the roller dog, tends toturn the latter as it moves back to normal position with its carrier orrocker, thus presentinga new surface to the action of the escapemcntwheel at the next printing operation.

Various changes may be made without departing from the spirit of myinvention.

'hat claim as new and desire to secure by Letters Patent, is

1. In a typewriting machine, the combination of a carriage; andescapement mechanism therefor comprising a feed rack, a dog rocker, afeed dog carried by said dog the plane of the feed rack, supportedindependently of the dog rocker, and adjustable means intermediate thedog rocker and said independently supported ter by the dog rocker.

2. In a typewriting machine, the combination of a carriage; andescapement mechanism therefor comprising a feed rack, a dog rocker, afeed dog carried by said dog rocker, and a roller dog cooperative withsaid feed rack and supported independently of said dog rocker but undercontrol thereof.

3. In a typewriting machine, the combination of .a carriage; andescapement mechanismtherefor comprising a feed rack, a dog rocker, afeed dog carried by said do rocker, a roller dog cooperative with saifeed rack and supported independently of said dog rocker, and adjustablemeans intermediate said do rocker and said independently supportedroller dog and through which control of the roller dog by the dog rockeris efiected.

4. In a typewriting machine, the comhination of a carriage; andescapement mocha nism therefor comprising a feed rack, a (log rocker; afeed dog carried by said rocker and moved thereby transversely of theplane of rocker and moved thereby transversely of 4 a second feed dogdog for controlling the actuation of the latthe feed rack, a second feeddog supported 'independently of said dog rocker and mounted for movementtransversely of the plane ofthe feed rack, means by, which said dogrocker is effective to control the transverse movement of theindependently supported dog, and adjustable means independent of saiddog rocker for limiting the return movement of the independentlysupported dog.

former isefi'ective tocontrol theg transverse movement of the latter. v

6. In a typewriting machine, the combination of acarriage; andescapementmechanism therefor comprising a feed rack, a dog rocker, a feed dogcarried by said rocker an moved thereby transversely of the plane of thefeed rack, a second feed dog supported independently of said og rockerand ,mounted for movement transversely of the plane of the feed rack,adjustable means intermediate'said dog rocker and independentlysupported dog and by which the former'is effective to control thetransverse movement of the 'latter, and adjustable means independent ofsaid dog rocker-for limitingthe return movement of said independentlysupported dog.

7. In a typewriting machine, the combination of a carriage; andescapement mechanism therefor comprising a feed rack, a dog rocker, afeed dog carried by said rocker and moved thereby transversely of theplane of the feed rack, a roller dog supported independently of said dogrocker and mounted for movement transversely of the plane of the feedrack, and means by which said dog rocker is efiectiveuto control thetransverse movement of the roller dog.

8. In a typewriting machine, the combina 'tion' of a carriage; andescapement' mechanism therefor comprising a feed rack, 21 dog rocker, afeed dog carried by said rocker and 55 moved thereby transversely of theplane of the feed rack, a roller dog, the-periphery of which constitutesit working face and which.

roller dog is supported independently'of said dog rocker and mounted formovement transversely of theplane of the feed rack 'into and out of thepath of the teeth thereof, and means by which said dog rocker is,etfective to control ofthe roller dog. e 9. In a typewritingmachine,'the combina- 5. In a typewriting machine, the combine; v

of the the transverse movement tion of a carriage; and escapement mecha'nism therefor comprising a feed rack, a dog rocker, a feed dog carriedby saida'ockcrand *moved thereby transversely of the plane of the'feedrack, a spring returned roller dog, the periphery of which constitutesits W01k ilig face and which roller dog is supported independently ofsaid dog rocker and mounted for movement transversely of the plane ofthe feed rack into and out of the path of the teeth thereof, andadjustable means intermediate the dog -roeker and roller dog and throughwhich said dog rockeris effective to control the roller dog in itstransverse movements. 10. In a typewriting machine, the combination of acarriage, and escapement mechanism therefor comprising a feed rack. adog rocker mounted for movement transversely of the plane of the feedrack, a feed dog carried by said rocker, a second i'pdepend entlysupported dog rocker mounted for movement transversely of the plane pfthe feed rack but controlled in such movement by said first mentioneddog rocker, and a feed dog carried by said second "dog rocker.

11. In a typewriting machine, the combination of a carriage; andescapcment mechanism therefor comprising a feed rack, a dog rockermounted for movement transversely of the plane ofthe feed rack, a feeddog car- -ried by said rocker, a second independently supported dogrocker mounted for movementtransversely of the plane of the feed inch,:1 feed dog carried by said second dog, rocker, and adjustable meansintermediate said dog rockers and through which'one dog rocker iseffective to control the movementof the other.

12. In a typewritingmaehine, the combination of apower driven carriage;and eseapement mechanism therefor comprising an escapement wheel, a keycontrolled spring returned dog rocker mounted to move transversely ofthe plane of the esoapeuient wheel, a stepping dog carried thereby, asecond do; rocker supported independently of said first mentioned dogrocker. an independent spring for-returning said "second dog pendentlysupported dog rocker and ll'\ able therewith transvcrselv of the planeof the escapement wheehand means by which the first mentioned dog rockeris effective to confirol the movement of the second dog r100 er. I y 13.In a typewriting machine. the combination of a power driven carriage;and escapement mechanism therefor romplising an esca'pement wheel, a keycontrolled spring returned dog rocker mounted to'move transversely ofthe plane of the esrapement wheel,

a stepping dog carried thereby. a second dogrocker supportedindependently of hilltl first i mentioned dog rocker, an independentrocker, a roller dog carried by said iude- 115 v capement mechanismtherefor comprising capement mechanism therefor comprising an withtransversely of the plane of the es spring for returning said second dogrocker, a roller dog carried by said independently 1 supported dogrocker and movable therewith transversely of the plane of the escapemcntwheel, the peri hery of the roller dog constituting its wor ing face,and ad justable means intermediate the do rockers and through which therocker for t e. roller dog is controlled in its movements by the keycontrolled dog rocker.

14. In a typewriting machine, the combination of a powerdriven'carriage; and esan escapement Wheel, a key controlled springreturned dog rocker, a pivoted and sliding stepping dog carried by saiddog rocker and movable therewith transversely of the plane of theescapement wheel, a second dog rocker supported independently of saidfirst mentioned dog rocker, an independent spring for returning saidsecond dog rocker, a roller dog carried by said independently supporteddog rocker and movable, therewith trans-' versely of the plane of theescapement wheel under control of the key controlled dog rocker, andameans independent of the-key controlled dog rocker for limiting the return movement of the second dog rocker.

15. In a typewriting machine, the combination of a power drivencarriage; and esescapement wheel, a key controlled s ring returned dogrocker, a pivoted and sliding stepping dog carried by said clog rockerand movable therewith transversely of the plane of the escapement wheel,a second dog rocker supported independently of said first mentioned dogrocker, an independent spring for returning said second dog rocker, aroller dog carried by said'independently supported dog rocker andmovable therecapement wheel, the peri hery of the roller dogconstituting" its wor ing face, anda'l' justable means intermediate thedo rockers and through which the rocker for the roller dog is controlledin its movements by the key controlled dogrocker.

16. In a typewriting machine, the combination of a power drivencarriage; and escapement mechanism therefor comprising a feed rack, afeed dog cooperating there- /with, and a spring for said dog, therebeing a lost motion between the spring and dog in the normal position ofthe parts.

17. In a typewritin machine,.the combination of a power driven carriage;and escapement mechanism therefor comtprising a feed rack, a feed dogcooperating erewith,

'- 1 ,osawss said dog beingmounted for sliding and pivotal movement, anda single spring for effecting both a sliding and a pivotal move-' mentof the dog, there being a lost motion between said dog and spring duringone of capement mechanism therefor comprising a feed rack, 9. etc pingdog, and a spring for advancin sai ste ping dog, the spring itselflimlting the a Vance movement of the do 1%). In a typewriting machine,the combination of a power driven carriage; and escapement mechanismtherefor comprising a feed rack, a stepping dog, and a spring foradvancing said stepping dog, the power of the spring exhausting itselfat the termination, of the advance movement of the dog to thus arrestthe advance of the dog by the spring itself.

20. In a typewriting machine, the combination of a power drivencarriage; and escapement mechanism therefor comprising a feed rack, astepping dog mounted for pivotal and sliding movement, a single I springfor effecting both a pivotal and a sliding movement of the dog, therebeinga lost motion between the dog and spring in the pivotal movement ofthe dog.

21. In a typewriting machine, the combinationof a power driven carriage;and escapement mechanism therefor comprising a feed. rack, a steppingdog mounted forpivotal and sliding movement, a single spring foreffecting both a pivotal and a sliding movement of the dog, theadvance-movement of the dog being limited by the spring itself.

22. In a typewriting machine, the comb1- nation of a power drivencarriage; and es capement mechanism therefor comprising a feed rack, astepping dog mounted for p 1v ota'l and sliding movement, a singlespring for effecting both a pivotal and a sliding, advancing movement ofthe dog, the power of the spring exhausting itself: at the terminationof the advance movement of the dog to thus arrest the advance of the dogby the spring itself.

Signed at the borough of Manhattan, city of New York, in the county ofNew York, and State of New York, this 10th day of O0- tober A. D. 1912.

CHARLES H. SHEPARD. Witnesses:

CHARLES E. SMITH,

Copies of this patent may be obtained for five cents each, By addressingthe "Oomznissioner of Patents,

Washington, D. 0.

